Developer utility

JSON & API Mock Engine

Paste JSON to generate TypeScript interfaces, Zod schemas, and JSONPath queries — entirely in your browser.

Input JSON

export interface Profile {
  email: string;
  score: number;
}

export interface Root {
  id: number;
  name: string;
  active: boolean;
  roles: string[];
  profile: Profile;
}

About this tool

What is the JSON & API Mock Engine?

Paste any JSON payload and instantly derive TypeScript interfaces, Zod schema source, and JSONPath listings. Everything runs in your browser — ideal for API mocking, contract sketching, and prompt prep without uploading secrets.

FAQ

Frequently asked questions

Does this send my JSON to a server?

No. Parsing and codegen execute entirely client-side. No tool-specific network requests are made for your input.

Is the Zod output a live validator?

The tool emits Zod schema source you can paste into a project that already depends on zod. It does not load Zod in the browser.